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Gazzar

2.5 petrol rebuild and conversion to EFI thread?

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Thanks! Is there a quick easy to decoke the combustion chamber? Mr muscle?

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As it is cast iron, yes, cilit bang, oven cleaner, or anything with caustic soda in it. 

Don't use on aluminium parts, too strong :)

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Yes, I don't understand chemistry, too close to magic, but I know caustic and ally don't work well.

I'll need to look up the acid that doesn't eat ally and does eat steel when I get to the door tops, though. But that's another day.

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On 1/16/2020 at 4:58 PM, FridgeFreezer said:

You just need smarter Series gauges... :D

3way.jpg.8de46a8f6335207bf65cd1412cc6dc06.jpg

They look nifty John. Easy to do?

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2 hours ago, Gazzar said:

Thanks! Is there a quick easy to decoke the combustion chamber? Mr muscle?

Carb cleaner and elbow grease is pretty good. Or send it out to an engine shop for a bath, it's not expensive and will come back nicely clean. 

Anything caustic on ali is a no-go. Dishwasher tabs eat it for breakfast! Ask me how I know... 

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13 hours ago, Jon White said:

They look nifty John. Easy to do?

Depends really - if you know how it's done it's nothing special, if you don't it's probably not a home project :lol:

 

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The verdict is mostly good, and better than I feared, a lot better. My engineer builder expert thinks the engine is fine and hasn't done a whole lot.

New shells. New cam, new followers and a couple of the tappets. He's happy with the rockers, but the bushes on the rockers need to be checked after the new rocker shaft, so might need replacing anyway.

The head would benefit from a skim, and the exhaust valves might need a bit taken away, they have ever so slightly the shadow of the seat in them.

He's going to do bring the head to his regular guy to do all that.

I'm going to replace the oil pump, because of the oil issues on the cam, probably an abundance of caution, though.

The crank could do with a very very slight polish, which he's shown me how to do, and the pistons need new rings, but only just.

So, stick it back together time coming soon!

I'll compose the parts list and send it off.

Who knows, this might be turning over by Easter!

I'm chuffed!  

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The bores need a hone. That's mostly it.

I'll order some nice shiny bits and high quality seals tomorrow time permitting.

 

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Are you doning some head work, or having that done?   You could get some horses and some tourqs extra from the head.  Would help the milage to.  

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It's supposedly a high compression head, Roland, from ACR, think it might be one of his, it's good a number stamped on it that ties in to one he did in the 1990's.

Although my mate didn't think much porting had been done to it.  

I'm getting it skimmed, and tested, that should do, along with the new cam and exhaust. Don't see the point to head work, it mostly favours the high RPMs.

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